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ES Chapter 29 Vocab

Terms in this set (24)

Constellation
A group of stars that form a pattern in the sky that resembles an animal, a mythological creature, or an everyday object.
circumpolar constellations
constellations that revolve around the North Star
Uses of constellations
planting, harvesting, rituals
Number of constellations
88
Star clusters
a group of stars that are gravitationally bound to one another
Binary stars
a system of two stars which are gravitationally bound to one another
Light year
the distance light travels in one year
Parsec
3.26 light years
Parallex
the apparent change in position of an object caused by the motion of the observer
Apparent magnitude
the brightness of a star as seen from Earth
Absolute magnitude
the brightness that a star would have at a distance of 32.6 light-years from Earth
Luminosity
The actual brightness of a star
Temperature spectra of stars
O, B, A, F, G, K, M (O is the hottest, M is the coolest)
73% of a star
Hydrogen
25% of a star
Helium
Red Giants
large, cool, luminous stars
White Dwarfs
dim, hot stars with a lot of mass
Nebula
A large cloud of dust and gas in space
Protostar
A contracting cloud of gas and dust; the earliest stage of a star's life
Neutron star
a star that has collapsed under gravity
Supernova
A gigantic explosion in which a massive star collapses and throws its outer layers into space
Black hole
An object in space whose gravity is so strong not even light can escape.
black dwarf
A white dwarf that has burnt out completely.
Super Giant star
Very similar to giant stars, except they are larger and burn a lot hotter
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